I don't know...not as well as you purport it does, I don't think. Maybe I should try it again. I usually just rehydrate by boiling 8oz of water in a mason jar for 3 minutes in the microwave at the beginning of the brew session, wait for it to come down to 95F, dump the yeast in, and let it rehydrate for the rest of the brew session. It's pretty easy. My last lager, I did that with 34/70, and stuck it in the fridge over night with my wort while it cooled to pitching temp. That worked out pretty well also.